Issue #9569 has been updated by Motohiro KOSAKI.


First off, thank you for providing number. Then we can discuss scientific way.
blog pages are not considered a formal document.

However I can't reproduce your conclusion. In my result, securerandom has one 
weak and /dev/urandom has two weaks.

https://gist.github.com/kosaki/3a9a9126cb39e601be2d

Of cource, this result doesn't mean urandom is crap. This just mean dieharder's output is unstable, I think.



----------------------------------------
Bug #9569: SecureRandom should try /dev/urandom first
https://bugs.ruby-lang.org/issues/9569#change-55923

* Author: Corey Csuhta
* Status: Rejected
* Priority: Normal
* Assignee: ruby-core
* ruby -v: 
* Backport: 
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Right now, `SecureRandom.random_bytes` tries to detect an OpenSSL to use before it tries to detect `/dev/urandom`. I think it should be the other way around. In both cases, you just need random bytes to unpack, so SecureRandom could skip the middleman (and [second point of failure](http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers/)) and just talk to `/dev/urandom` directly if it's available.

Is this a case of just re-ordering the two code chunks so that `/dev/urandom` is tried first?

Relevant lines: https://github.com/ruby/ruby/blob/trunk/lib/securerandom.rb#L59-L90



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